Apple produced its legally-mandated 'average monthly active’ App Store users numbers for the EU, for 2022:

iOS App Store: 101 million
iPadOS App Store: 23 million
macOS App Store: 6 million
tvOS App Store: 1 million
watchOS App Store: under 1 million
Apple Books: under 1 million
Podcasts paid subscriptions: under 1 million

/via https://www.apple.com/ie/legal/more-resources/dsa/ie/

Legal - European DSA Recipients of Services Report - Apple

Apple Legal
"Apple views each version of the App Store as a distinct online platform under the DSA, and only the iOS App Store may qualify as a [very large online platform]. Nonetheless, Apple intends, on an entirely voluntary basis, to align each of the existing versions of the App Store […] with the existing DSA requirements”
@stroughtonsmith emphasis on “existing”. Wanna bet the reality OS won’t be part of that?
@stroughtonsmith that is some razor sharp hair splitting. Kind of wild to distinguish app stores that inherently allow cross-installs by default.
@stroughtonsmith according to 2020 data, 1/4 of the pop. of EU uses the iOS App Store monthly.